Soliton self-compression and resonant dispersive wave emission in higher-order modes of a hollow capillary fibre
Soliton self-compression and resonant dispersive wave emission in higher-order modes of a hollow capillary fibre
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DOI：
10.1088/2515-7647/ac6345
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
C. Brahms;J. Travers
中科院分区：
文献类型：
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作者：
C. Brahms;J. Travers
研究了充气中空毛细管光纤中高阶模孤子的自压缩和紫外共振色散波的发射。我们简单的分析缩放规则预测较短的所需波导和不同的能量尺度时，从基本的高阶模式。在实验上，我们证明孤子自压缩和紫外色散波发射的双瓣LP 11模式的充氩HCF，我们激发耦合到光纤在斜入射。我们观察到紫外色散波的产生，由于模式色散更强，与基模产生相比，紫外色散波的频率发生了变化，并且更加窄带，并且色散波和泵浦脉冲之间的超连续谱受到抑制。通过数值模拟，我们证实了我们的标度规则的预测，并发现使用高阶模式可以抑制光电离和等离子体效应，即使允许更高的脉冲能量用于自压缩过程。我们的研究结果增加了另一个自由度的空心波导系统的设计，产生子周期场瞬态和可调谐的超短激光脉冲。
We investigate soliton self-compression and ultraviolet resonant dispersive wave emission in the higher-order modes of a gas-filled hollow capillary fibre (HCF). Our simple analytical scaling rules predict shorter required waveguides and different energy scales when moving from the fundamental to higher-order modes. Experimentally, we demonstrate soliton self-compression and ultraviolet dispersive wave emission in the double-lobe LP11 mode of an argon-filled HCF, which we excite by coupling into the fibre at oblique incidence. We observe the generation of ultraviolet dispersive waves which are frequency-shifted and more narrowband as compared to fundamental-mode generation due to the stronger modal dispersion, and a suppression of the supercontinuum between the dispersive wave and the pump pulse. With numerical simulations, we confirm the predictions of our scaling rules and find that the use of higher-order modes can suppress photoionisation and plasma effects even while allowing for much higher pulse energy to be used in the self-compression process. Our results add another degree of freedom for the design of hollow-waveguide systems to generate sub-cycle field transients and tuneable ultrashort laser pulses.